One of the films at Sundance that flew under the radar this year was jetpack fantasy Pretty Bird, based on the book The Rocketbelt Caper. The film is billed as a comedy, but the real story is both weird and disturbing — more of a comedy of errors. It explores the story of an engineer who built a rocket belt that can… »1/28/08 1:30pm 1/28/08 1:30pm